8051002: Incorrectly merged share/vm/classfile/classFileParser.cpp was pushed to 8u20.

Summary: Correct fix for allowing BootstrapMethods attribute with an empty bootstrap_methods table.
Reviewed-by: coleenp, ctornqvi, hseigel

src/share/vm/classfile/classFileParser.cpp

@@ -2780,7 +2780,7 @@ void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_b
   ClassFileStream* cfs = stream();
   u1* current_start = cfs->current();
 
-  guarantee_property(attribute_byte_length > sizeof(u2),
+  guarantee_property(attribute_byte_length >= sizeof(u2),
                      "Invalid BootstrapMethods attribute length %u in class file %s",
                      attribute_byte_length,
                      CHECK);
@@ -2793,11 +2793,6 @@ void ClassFileParser::parse_classfile_bootstrap_methods_attribute(u4 attribute_b
                      "Short length on BootstrapMethods in class file %s",
                      CHECK);
 
-  guarantee_property(attribute_byte_length >= sizeof(u2),
-                     "Invalid BootstrapMethods attribute length %u in class file %s",
-                     attribute_byte_length,
-                     CHECK);
-
   // The attribute contains a counted array of counted tuples of shorts,
   // represending bootstrap specifiers:
   //    length*{bootstrap_method_index, argument_count*{argument_index}}